Experimental detection of α-particles from the radioactive decay of natural bismuth

Pierre de Marcillac, Noël Coron (), Gérard Dambier, Jacques Leblanc and Jean-Pierre Moalic
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Pierre de Marcillac: Institut d'Astrophysique Spatiale, CNRS & Université Paris Sud, UMR 8617
Noël Coron: Institut d'Astrophysique Spatiale, CNRS & Université Paris Sud, UMR 8617
Gérard Dambier: Institut d'Astrophysique Spatiale, CNRS & Université Paris Sud, UMR 8617
Jacques Leblanc: Institut d'Astrophysique Spatiale, CNRS & Université Paris Sud, UMR 8617
Jean-Pierre Moalic: Institut d'Astrophysique Spatiale, CNRS & Université Paris Sud, UMR 8617

Nature, 2003, vol. 422, issue 6934, 876-878

Abstract: Abstract The only naturally occurring isotope of bismuth, 209Bi, is commonly regarded as the heaviest stable isotope. But like most other heavy nuclei abundant in nature and characterized by an exceptionally long lifetime, it is metastable with respect to α-decay1. However, the decay usually evades observation because the nuclear structure2,3 of 209Bi gives rise to an extremely low decay probability and, moreover, generates low-energy α-particles difficult to detect. Indeed, dedicated experiments2,3,4,5,6 attempting to record the α-decay of 209Bi in nuclear emulsions failed. However, scintillating bolometers7,8,9 operated at temperatures below 100 mK offer improved detection efficiency and sensitivity, whereas a broad palette of targets could be available10. Here we report the successful use of this method for the unambiguous detection of 209Bi α-decay in bismuth germanate detectors cooled to 20 mK. We measure an energy release of 3,137 ± 1 (statistical) ± 2 (systematic) keV and a half-life of (1.9 ± 0.2) × 1019 yr, which are in agreement with expected values.

Date: 2003
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DOI: 10.1038/nature01541

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